My old and one of my first betta Eggbert (SIP) used to flare quite hard when he would, but also he would open is mouth as wide as he could while flaring. (Lol it kinda looked like he was yelling) Originaly I thought it was just how bettas flared, but I have never seen any of my other betta's ever flare like that. Anyone elses betta do that or anything else when flaring?

Our males will get really big and swim sideways darting from one end of the tank to the other. 2 of our females will try and bit whatever is used to make them flare (usually a pen or when seeing the males)